diff --git a/nix/sources.json b/nix/sources.json
index 8c382b5..03c3b35 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -23,19 +23,19 @@
         "homepage": "https://mattermost.com",
         "owner": "mattermost",
         "repo": "mattermost-server",
-        "rev": "5fa8499602d061b4e8d7c71800bfaab89e27493d",
-        "sha256": "1b2hjcsmqrq00dz9n57sml32g7j89xwq5l8ayla6riwank19hhsg",
+        "rev": "7fa6b321ae6e0663ee7b576cc2b3b6fd06773b6d",
+        "sha256": "1fkjdq5fj0ps70lblysxc9c74sig4jc70qnaf0yq6qivy7x8vlw5",
         "type": "tarball",
-        "url": "https://github.com/mattermost/mattermost-server/archive/refs/tags/v6.1.3.tar.gz",
+        "url": "https://github.com/mattermost/mattermost-server/archive/refs/tags/v6.4.0.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/refs/tags/v<version>.tar.gz",
-        "version": "6.1.3"
+        "version": "6.4.0"
     },
     "mattermost-webapp": {
-        "sha256": "039ipjc9c8qlhq2d5xyy3qm6nha5p0x721pjd6gzxy56skgd8ill",
+        "sha256": "1675fwlx5n6qhii7zzdq9nzy7ypndwm55rhmda6a0fps6a85ps25",
         "type": "tarball",
-        "url": "https://releases.mattermost.com/6.1.3/mattermost-6.1.3-linux-amd64.tar.gz",
+        "url": "https://releases.mattermost.com/6.4.0/mattermost-6.4.0-linux-amd64.tar.gz",
         "url_template": "https://releases.mattermost.com/<version>/mattermost-<version>-linux-amd64.tar.gz",
-        "version": "6.1.3"
+        "version": "6.4.0"
     },
     "niv": {
         "branch": "master",